Wireless charging for low power applications using Qi standard

Abstract

Wireless power charging powers the storage device without any cords which makes the device more compact, water proof, easy to use and provide even more comfort. The efficiency of power transfer depends on many factors, few of them are quality factor of the inductor coil, coupling coefficient, distance between receiver and transmitter coil, impact of core used for the coil. This paper discusses about wireless power transfer by inductive coupling technique, design considerations of the coil used for power transfer and tuning of LC tank circuit to attain resonant frequency between transmitter and receiver.